摘要
在温度为30℃±1℃条件下,以改性聚乙烯为填料,人工配置无机NH+4-N废水为进水,研究生物膜短程硝化系统的恢复过程.短程硝化首先通过过量曝气破坏,使NOB适应高浓度游离氨后,在连续曝气条件下,DO控制在0.5 mg·L^(-1)以下,FA控制在1.5 mg·L^(-1)以上,维持反应器运行83 d未实现短程硝化,84 d改连续曝气为间歇曝气,出现NO-2-N积累现象,142 d再次验证这一规律.随着反应器的运行,生物膜系统中为ANAMMOX菌提供了生存环境,厌氧氨氧化作用产生,短程硝化系统逐步转化为CANON工艺,并逐渐增加进水NH+4-N浓度和进水流量,反应器的TN去除率与TN去除负荷逐渐提高.当反应器运行至450 d,TN去除率达到64.03%,去除负荷为2.52 kg·(m^3·d)^(-1).因此,一旦NOB适应了高浓度的游离氨,生物膜系统的短程硝化恢复不易实现,但间歇曝气是一个有效的方法,随着反应器的连续运行,短程硝化工艺最终转化为CANON工艺,而且,这一转变进一步强化了短程硝化的稳定性.
A short-cut nitrification process with modified polyethylene as carrier was operated to investigate the biofilm short-cut nitrification recovery using synthetic inorganic ammonia-rich wastewater as influent at 30℃ ± 1℃.The short-cut nitrification was destroyed first by excessive aeration,and it was not built in 83 days under the condition of continuous aeration with DO less than 0.5mg·L^-1and free ammonia（FA） more than 1.5 mg·L^-1,which are very beneficial to short-cut nitrification.However,short-cut nitrification was realized by changing continuous aeration to intermittent aeration on 84 thday,and it was proved again on 142 ndday.After that,biofilm system provided a living environment for ANAMMOX bacteria,anaerobic ammonia oxidation occurred,and the biofilm short-cut nitrification process was gradually transformed into CANON process.As the load of influent and aeration increased,the total nitrogen removal efficiency and removal load increased,and the total nitrogen removal load could reach up to 2.52kg·（m^3·d）^-1.Finally,in the 3rd stage,ΔNO_3^--N/ΔTN was 0.10 on average,which means stabe short-cut nitrification in the CANON process.Therefore,once NOB was adapted to FA,it would be not very easy to recover short-cut nitrification,while intermittent aeration was an effective way,and the nitriation process would be finally transformed into CANON process,which would further improve the short-cut nitrification stability.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2017年第4期1536-1543,共8页
Environmental Science
基金
国家自然科学基金项目(51308025)
北京市科研基地建设项目(2016)
关键词
生物膜
短程硝化
亚硝酸化率
CANON工艺
游离氨
厌氧氨氧化
biofilm
short-cut nitrification
nitrite accumulation rate
CANON process
free ammonia（FA）
anaerobic ammonium oxidation（ANAMMOX）
